This organic PK liquid bloom booster is extracted from our unique natural sources of phosphorous and potassium. Bat guano, renowned as an organic source of phosphorous, is combined with Langbeinite, a natural source of potassium mined from ancient sea beds in the American southwest. HPK is minimally processed to preserve all of the benefits and synergistic qualities found in our ingredients. It effectively improves flower quality and is for use in soil and hydroponics.